feat: integrate Pi backend and Pi Web

pi-web/lib/git-status.ts

@@ -0,0 +1,47 @@
+import type { GitFileStatus } from "./git-types";
+
+export interface GitPorcelainEntry {
+  path: string;
+  originalPath?: string;
+  indexStatus: string;
+  worktreeStatus: string;
+}
+
+function usesRenamePath(indexStatus: string, worktreeStatus: string): boolean {
+  return indexStatus === "R" || indexStatus === "C" || worktreeStatus === "R" || worktreeStatus === "C";
+}
+
+export function parseGitPorcelainV1(output: string): GitPorcelainEntry[] {
+  const records = output.split("\0");
+  const entries: GitPorcelainEntry[] = [];
+
+  for (let i = 0; i < records.length; i++) {
+    const record = records[i];
+    if (!record || record.length < 4 || record[2] !== " ") continue;
+    const indexStatus = record[0];
+    const worktreeStatus = record[1];
+    const entry: GitPorcelainEntry = {
+      path: record.slice(3),
+      indexStatus,
+      worktreeStatus,
+    };
+    if (usesRenamePath(indexStatus, worktreeStatus)) {
+      entry.originalPath = records[++i] || undefined;
+    }
+    entries.push(entry);
+  }
+
+  return entries;
+}
+
+const CONFLICT_STATUSES = new Set(["DD", "AU", "UD", "UA", "DU", "AA", "UU"]);
+
+export function classifyGitStatus(entry: GitPorcelainEntry): Pick<GitFileStatus, "status" | "code"> {
+  const pair = `${entry.indexStatus}${entry.worktreeStatus}`;
+  if (pair === "??") return { status: "untracked", code: "U" };
+  if (CONFLICT_STATUSES.has(pair) || pair.includes("U")) return { status: "conflict", code: "C" };
+  if (pair.includes("D")) return { status: "deleted", code: "D" };
+  if (pair.includes("R") || pair.includes("C")) return { status: "renamed", code: "R" };
+  if (pair.includes("A")) return { status: "added", code: "A" };
+  return { status: "modified", code: "M" };
+}